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<title>CodecSpecificDataUtil (ExoPlayer library)</title>
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">com.google.android.exoplayer2.util</a></div>
<h2 title="Class CodecSpecificDataUtil" class="title">Class CodecSpecificDataUtil</h2>
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<pre>public final class <span class="typeNameLabel">CodecSpecificDataUtil</span>
extends <a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></pre>
<div class="block">Provides utilities for handling various types of codec-specific data.</div>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>static <a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#buildAvcCodecString(int,int,int)">buildAvcCodecString</a></span>&#8203;(int&nbsp;profileIdc,
                   int&nbsp;constraintsFlagsAndReservedZero2Bits,
                   int&nbsp;levelIdc)</code></th>
<td class="colLast">
<div class="block">Builds an RFC 6381 AVC codec string using the provided parameters.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink" target="_top">List</a>&lt;byte[]&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#buildCea708InitializationData(boolean)">buildCea708InitializationData</a></span>&#8203;(boolean&nbsp;isWideAspectRatio)</code></th>
<td class="colLast">
<div class="block">Returns initialization data for formats with MIME type <a href="MimeTypes.html#APPLICATION_CEA708"><code>MimeTypes.APPLICATION_CEA708</code></a>.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#buildHevcCodecStringFromSps(com.google.android.exoplayer2.util.ParsableNalUnitBitArray)">buildHevcCodecStringFromSps</a></span>&#8203;(<a href="ParsableNalUnitBitArray.html" title="class in com.google.android.exoplayer2.util">ParsableNalUnitBitArray</a>&nbsp;bitArray)</code></th>
<td class="colLast">
<div class="block">Returns an RFC 6381 HEVC codec string based on the SPS NAL unit read from the provided bit
 array.</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static byte[]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#buildNalUnit(byte%5B%5D,int,int)">buildNalUnit</a></span>&#8203;(byte[]&nbsp;data,
            int&nbsp;offset,
            int&nbsp;length)</code></th>
<td class="colLast">
<div class="block">Constructs a NAL unit consisting of the NAL start code followed by the specified data.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>static <a href="https://developer.android.com/reference/android/util/Pair.html" title="class or interface in android.util" class="externalLink">Pair</a>&lt;<a href="https://developer.android.com/reference/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>,&#8203;<a href="https://developer.android.com/reference/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_top">Integer</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseAlacAudioSpecificConfig(byte%5B%5D)">parseAlacAudioSpecificConfig</a></span>&#8203;(byte[]&nbsp;audioSpecificConfig)</code></th>
<td class="colLast">
<div class="block">Parses an ALAC AudioSpecificConfig (i.e.</div>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#parseCea708InitializationData(java.util.List)">parseCea708InitializationData</a></span>&#8203;(<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink" target="_top">List</a>&lt;byte[]&gt;&nbsp;initializationData)</code></th>
<td class="colLast">
<div class="block">Returns whether the CEA-708 closed caption service with the given initialization data is
 formatted for displays with 16:9 aspect ratio.</div>
</td>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>static byte[][]</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#splitNalUnits(byte%5B%5D)">splitNalUnits</a></span>&#8203;(byte[]&nbsp;data)</code></th>
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<div class="block">Splits an array of NAL units.</div>
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<a id="parseAlacAudioSpecificConfig(byte[])">
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<h4>parseAlacAudioSpecificConfig</h4>
<pre class="methodSignature">public static&nbsp;<a href="https://developer.android.com/reference/android/util/Pair.html" title="class or interface in android.util" class="externalLink">Pair</a>&lt;<a href="https://developer.android.com/reference/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink">Integer</a>,&#8203;<a href="https://developer.android.com/reference/java/lang/Integer.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_top">Integer</a>&gt;&nbsp;parseAlacAudioSpecificConfig&#8203;(byte[]&nbsp;audioSpecificConfig)</pre>
<div class="block">Parses an ALAC AudioSpecificConfig (i.e. an <a href="https://github.com/macosforge/alac/blob/master/ALACMagicCookieDescription.txt">ALACSpecificConfig</a>).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>audioSpecificConfig</code> - A byte array containing the AudioSpecificConfig to parse.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A pair consisting of the sample rate in Hz and the channel count.</dd>
</dl>
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<h4>buildCea708InitializationData</h4>
<pre class="methodSignature">public static&nbsp;<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink" target="_top">List</a>&lt;byte[]&gt;&nbsp;buildCea708InitializationData&#8203;(boolean&nbsp;isWideAspectRatio)</pre>
<div class="block">Returns initialization data for formats with MIME type <a href="MimeTypes.html#APPLICATION_CEA708"><code>MimeTypes.APPLICATION_CEA708</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>isWideAspectRatio</code> - Whether the CEA-708 closed caption service is formatted for displays
     with 16:9 aspect ratio.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Initialization data for formats with MIME type <a href="MimeTypes.html#APPLICATION_CEA708"><code>MimeTypes.APPLICATION_CEA708</code></a>.</dd>
</dl>
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<h4>parseCea708InitializationData</h4>
<pre class="methodSignature">public static&nbsp;boolean&nbsp;parseCea708InitializationData&#8203;(<a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink" target="_top">List</a>&lt;byte[]&gt;&nbsp;initializationData)</pre>
<div class="block">Returns whether the CEA-708 closed caption service with the given initialization data is
 formatted for displays with 16:9 aspect ratio.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>initializationData</code> - The initialization data to parse.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Whether the CEA-708 closed caption service is formatted for displays with 16:9 aspect
     ratio.</dd>
</dl>
</li>
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<a id="buildAvcCodecString(int,int,int)">
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<h4>buildAvcCodecString</h4>
<pre class="methodSignature">public static&nbsp;<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink" target="_top">String</a>&nbsp;buildAvcCodecString&#8203;(int&nbsp;profileIdc,
                                         int&nbsp;constraintsFlagsAndReservedZero2Bits,
                                         int&nbsp;levelIdc)</pre>
<div class="block">Builds an RFC 6381 AVC codec string using the provided parameters.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>profileIdc</code> - The encoding profile.</dd>
<dd><code>constraintsFlagsAndReservedZero2Bits</code> - The constraint flags followed by the reserved zero
     2 bits, all contained in the least significant byte of the integer.</dd>
<dd><code>levelIdc</code> - The encoding level.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An RFC 6381 AVC codec string built using the provided parameters.</dd>
</dl>
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<a id="buildHevcCodecStringFromSps(com.google.android.exoplayer2.util.ParsableNalUnitBitArray)">
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<h4>buildHevcCodecStringFromSps</h4>
<pre class="methodSignature">public static&nbsp;<a href="https://developer.android.com/reference/java/lang/String.html" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;buildHevcCodecStringFromSps&#8203;(<a href="ParsableNalUnitBitArray.html" title="class in com.google.android.exoplayer2.util" target="_top">ParsableNalUnitBitArray</a>&nbsp;bitArray)</pre>
<div class="block">Returns an RFC 6381 HEVC codec string based on the SPS NAL unit read from the provided bit
 array. The position of the bit array must be the start of an SPS NALU (nal_unit_header), and
 the position may be modified by this method.</div>
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<h4>buildNalUnit</h4>
<pre class="methodSignature">public static&nbsp;byte[]&nbsp;buildNalUnit&#8203;(byte[]&nbsp;data,
                                  int&nbsp;offset,
                                  int&nbsp;length)</pre>
<div class="block">Constructs a NAL unit consisting of the NAL start code followed by the specified data.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - An array containing the data that should follow the NAL start code.</dd>
<dd><code>offset</code> - The start offset into <code>data</code>.</dd>
<dd><code>length</code> - The number of bytes to copy from <code>data</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The constructed NAL unit.</dd>
</dl>
</li>
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<h4>splitNalUnits</h4>
<pre class="methodSignature">@Nullable
public static&nbsp;byte[][]&nbsp;splitNalUnits&#8203;(byte[]&nbsp;data)</pre>
<div class="block">Splits an array of NAL units.

 <p>If the input consists of NAL start code delimited units, then the returned array consists of
 the split NAL units, each of which is still prefixed with the NAL start code. For any other
 input, null is returned.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>data</code> - An array of data.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The individual NAL units, or null if the input did not consist of NAL start code
     delimited units.</dd>
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